**Part Number:**LM2623

**Other Parts Discussed in Thread:**LM2621

Hello,

for a current project I'm in need for a boost converter, that provides up to 400mA at 6V (normal operation <350mA). For input I have two alkaline AA cells in series. The minimum supported input voltage should therefore be close to 1.8V.

The device has to provide this current for a maximum of 20s and will be able to cool down afterwards for at least 40s.

I calculated a peak current of 1.71A, which should be ok for the LM2623.

However looking at Figure 7 in the datasheet I am worried, that for the given parameters a stable output voltage can't be achieved.

My current schematic looks like this:

I also considered the LM2621 for this application and am happy to consider other devices if they fit my budget.

Thanks in advance for any advice.

Philipp Schaefer